tests: gpioset: test the 'time' mode
tests: gpioset: test the 'time' mode

Order gpioset to wait for 100 milliseconds before exiting, then sleep
for 200 milliseconds before checking if it exited correctly.

Signed-off-by: Bartosz Golaszewski <108de5fbc428215dc26df4468b48691526611148@gmail.com>

brgl/libgpiod,brgl/libgpiod,brgl/libgpiod,brgl/libgpiod